Layout/ClassStructure crashes when constant with inline comment precedes 'extend'

[gongfarmer]

Layout/ClassStructure class gets an internal error on the minimal code example provided below.

Expected behavior

Layout/ClassStructure cop should not encounter internal error when checking this code example.

Actual behavior

$ cat .rubocop.yml
AllCops:
  NewCops: enable

Layout/ClassStructure:
  Enabled: true

$ cat grid_task.rb 
# frozen_string_literal: true

class GridTask
  DESC = 'Grid Task' # grid task name OID, subclasses should set this
  extend Helpers::MakeFromFile
end

$ rubocop  -d grid_task.rb 
For $DIR: configuration from $DIR/.rubocop.yml
Default configuration from /var/lib/gems/2.5.0/gems/rubocop-1.16.0/config/default.yml
Inspecting 1 file
Scanning $DIR/grid_task.rb
An error occurred while Layout/ClassStructure cop was inspecting $DIR/grid_task.rb:4:0.
Parser::Source::TreeRewriter detected clobbering
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter.rb:427:in `trigger_policy'
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter.rb:414:in `enforce_policy'
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter/action.rb:233:in `call'
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter/action.rb:233:in `swallow'
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter/action.rb:97:in `with'
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter/action.rb:119:in `place_in_hierarchy'
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter/action.rb:106:in `do_combine'
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter/action.rb:30:in `combine'
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter.rb:400:in `combine'
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter.rb:194:in `replace'
/var/lib/gems/2.5.0/gems/parser-3.0.1.1/lib/parser/source/tree_rewriter.rb:218:in `remove'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/layout/class_structure.rb:181:in `autocorrect'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/layout/class_structure.rb:162:in `block (2 levels) in on_class'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/base.rb:342:in `correct'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/base.rb:127:in `add_offense'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/layout/class_structure.rb:162:in `block in on_class'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/layout/class_structure.rb:227:in `block in walk_over_nested_class_definition'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/layout/class_structure.rb:223:in `each'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/layout/class_structure.rb:223:in `walk_over_nested_class_definition'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/layout/class_structure.rb:158:in `on_class'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/commissioner.rb:100:in `public_send'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/commissioner.rb:100:in `block (2 levels) in trigger_responding_cops'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/commissioner.rb:160:in `with_cop_error_handling'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/commissioner.rb:99:in `block in trigger_responding_cops'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/commissioner.rb:98:in `each'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/commissioner.rb:98:in `trigger_responding_cops'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/commissioner.rb:69:in `on_class'
/var/lib/gems/2.5.0/gems/rubocop-ast-1.7.0/lib/rubocop/ast/traversal.rb:20:in `walk'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/commissioner.rb:86:in `investigate'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/team.rb:155:in `investigate_partial'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cop/team.rb:83:in `investigate'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:310:in `inspect_file'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:254:in `block in do_inspection_loop'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:288:in `block in iterate_until_no_changes'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:281:in `loop'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:281:in `iterate_until_no_changes'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:250:in `do_inspection_loop'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:130:in `block in file_offenses'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:155:in `file_offense_cache'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:129:in `file_offenses'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:120:in `process_file'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:101:in `block in each_inspected_file'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:100:in `each'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:100:in `reduce'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:100:in `each_inspected_file'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:86:in `inspect_files'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/runner.rb:47:in `run'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cli/command/execute_runner.rb:26:in `block in execute_runner'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cli/command/execute_runner.rb:52:in `with_redirect'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cli/command/execute_runner.rb:25:in `execute_runner'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cli/command/execute_runner.rb:17:in `run'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cli/command.rb:11:in `run'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cli/environment.rb:18:in `run'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cli.rb:65:in `run_command'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cli.rb:72:in `execute_runners'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/lib/rubocop/cli.rb:41:in `run'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/exe/rubocop:12:in `block in <top (required)>'
/usr/lib/ruby/2.5.0/benchmark.rb:308:in `realtime'
/var/lib/gems/2.5.0/gems/rubocop-1.16.0/exe/rubocop:12:in `<top (required)>'
/usr/local/bin/rubocop:23:in `load'
/usr/local/bin/rubocop:23:in `<main>'
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Layout/ClassStructure cop was inspecting $DIR/grid_task.rb:4:0.
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
https://github.com/rubocop/rubocop/issues

Mention the following information in the issue report:
1.16.0 (using Parser 3.0.1.1, rubocop-ast 1.7.0, running on ruby 2.5.5 x86_64-linux-gnu)
Finished in 0.23941434547305107 seconds

Steps to reproduce the problem

• update rubocop config to enable Layout/ClassStructure (see dump of minimal .rubocop.yml above)
• copy the code from the file grid_task.rb above
• run rubocop on grid_task.rb

RuboCop version

$ rubocop -V
1.16.0 (using Parser 3.0.1.1, rubocop-ast 1.7.0, running on ruby 2.5.5 x86_64-linux-gnu)